ascertain vs hear

ascertain and hear both are verbs.

Word	Noun	Adjective	Verb	Adverb
ascertain	No	No	Yes	No
hear	No	No	Yes	No

As verbs, hear is a hypernym of ascertain; that is, hear is a word with a broader meaning than ascertain:

Other hypernyms of ascertain include discover, find out, get a line, get wind, get word, learn, pick up, see.

ascertain (verb)	hear (verb)
be careful or certain to do something; make certain of something	get to know or become aware of, usually accidentally
learn or discover with certainty	perceive (sound) via the auditory sense
find out, learn, or determine with certainty, usually by making an inquiry or other effort	receive a communication from someone
establish after a calculation, investigation, experiment, survey, or study	listen and pay attention
	examine or hear (evidence or a case) by judicial process